s390/qeth: don't check drvdata in sysfs code
Given the way how the sysfs attributes are registered / unregistered, the show/store helpers will never be called with a NULL drvdata. Signed-off-by: NJulian Wiedmann <jwi@linux.ibm.com> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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